CPV code 71610000 designates Composition and purity testing and analysis services in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
71610000 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 71600000 (Technical testing, analysis and consultancy services).